add thumbnails to outfits#show via open graph

app/helpers/application_helper.rb

@@ -1,4 +1,12 @@
 module ApplicationHelper
+  def absolute_url(path_or_url)
+    if path_or_url.include?('://') # already an absolute URL
+      path_or_url
+    else # a relative path
+      request.protocol + request.host_with_port + path_or_url
+    end
+  end
+  
   def add_body_class(class_name)
     @body_class ||= ''
     @body_class << " #{class_name}"
@@ -101,6 +109,23 @@ module ApplicationHelper
     hidden_field_tag 'origin', value, :id => nil
   end
   
+  def open_graph(properties)
+    if @open_graph
+      @open_graph.merge! properties
+    else
+      @open_graph = properties
+    end
+  end
+  
+  def open_graph_tags
+    if @open_graph
+      @open_graph.inject('') do |output, property|
+        key, value = property
+        output + tag(:meta, :property => "og:#{key}", :content => value)
+      end.html_safe
+    end
+  end
+
   def return_to_field_tag
     hidden_field_tag :return_to, request.fullpath
   end

app/views/layouts/application.html.haml

@@ -14,6 +14,7 @@
     = yield :stylesheets
     = stylesheet_link_tag "compiled/screen"
     = yield :meta
+    = open_graph_tags
     = csrf_meta_tag
     = signed_in_meta_tag
   %body{:class => body_class}

app/views/outfits/show.html.haml

@@ -1,6 +1,11 @@
 - title(@outfit.name || "Shared outfit")
 - content_for :before_title, campaign_progress
 
+- open_graph :type => 'openneo-impress:outfit', :title => yield(:title),
+  :url => outfit_url(@outfit)
+- if @outfit.image?
+  - open_graph :image => absolute_url(@outfit.image.url)
+
 = link_to_edit_outfit(@outfit, :class => 'button', :id => 'outfit-wardrobe-link') do
   Edit
   - unless user_signed_in? && @outfit.user == current_user